Convertible cushion



FIG. 1 is a top perspective view of the convertible cushion with the ball inside of the cushion;

FIG. 2 is a bottom perspective view of the convertible cushion, taken from below the lower corner at the upper side of the drawing in FIG. 1, with the ball inside of the cushion;

FIG. 3 is a top perspective view of the convertible cushion showing the ball partially extended from the cushion;

FIG. 4 is a top perspective view of the ball with the cushion inside of the ball; and,

FIG. 5 is a bottom perspective view of the ball with the cushion inside of the ball. 

The ornamental design for a convertible cushion, as shown and described. 